Lorries you can turn the dashboard lights off

While waiting to get tipped at Heathrow I saw a paddy tearing his dash to bits being nosey I asked what’s up? I came down last night with no dash lights, must fix them now, I can’t drive this beast without knowing my speed. He had spent all morning stripping out the fuse box and dash and was going to start again, saying there must be a line fuse, I leaned in and turned the dimmer switch and the dash lit up, he screamed what did you do ? B… h… with me being Irish please don’t tell anyone I will be a right numpty and I said cross my heart and hope to die, but you know me! Joepipe